Quiet hours in Boulder County, CO — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
In unincorporated Boulder County, sound from a non-vehicular source in a residential area cannot exceed 55 dB(A) from 7 a.m. to 7 p.m., dropping to 50 dB(A) at night (7 p.m.-7 a.m.). Cities like Boulder and Longmont set their own quiet hours.
County Ordinance No. 92-28, Section 1.01.050(C) sets a residential daytime cap of 55 dB(A) (7 a.m.-7 p.m.) and a nighttime cap of 50 dB(A) (7 p.m.-7 a.m.), measured 10 feet from the property line. Periodic, impulsive, or shrill noises are unlawful at 5 dB(A) below those limits. The county mirrors Colorado's state maximums in CRS 25-12-103. If you live inside an incorporated city (Boulder, Longmont, Louisville, Lafayette, Superior), that city's noise code applies instead of the county's.
Violating Ordinance 92-28 is a Class 2 Petty Offense: a $30 fine per violation, rising $30 per repeat offense within one year to a $300 maximum, plus court costs.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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